Process of manufacturing yeast.



,excee JACOB .BLUME'R, or PEEKSKILL,NEW YORK.

PROCESS OF MANUFACTURING YEAST.

Specificatiodof Letters Patent.

Patented May 28, 1907.

Application filed July 25, 1906- Serial No 327,636.

To all whom it may concern:

Be it known that I, J AOOB BLUMER, a citizen of the United States, and a resident of Peekskill, in the county of Westchester and State of New York, have invented a new and Improved Process of Manufacturing Yeast, of which the following is a full, clear, and exact description.

This invention relates to methods of manufacturing yeast in general, and the main object is to supply the yeast plant in process of 'ation with a cheap nutriment which is ingly rich in soluble stances, thereby en'ablin the manufacture of a yeast of great leavemng power, andalso producing a larger yield of yeast.

My method is especially useful for the propa manufacture of yeast from molasses and the nitrogenous substances,

result therefrom is an article of the highest uality and of such immense leavening power t at one part of this yeast will do the work of two parts of the usual compressed yeast 'of the trade, or if desiccated it will still retain enough leavenin power that one ound of dried yeast is equa to one pound o regular'com ressed yeast of the market.

The a ove-mentioned nutriment of soluble I extract from cotton-seed meal which is a staple article of this country but which heretofore has never been used for the manufacture of yeast.

I will describe'the process of manufacturing yeast embodying my invention, and then ponit outthe novel features in the appended claims. I

It is known that there are a good many microbes which produce enzyme which have the faculty of reducing albuminous substances to -peptones and in a number of cases this enzymic action goes together with the formation of lactic acid, and the one is in direct proportion to the other. My invention involves this lactic acid formation, together with the proportionate enzymic action of the lactic acid orggnisms.

carrying out m cotton-seed meal an method 5000 lbs. of about 3000 gallons of ,warmwater of about 60 C. are mashed or mixed together in a tank, the temperature of the finished mixture bein C. which is best adapted ortion of a the forma lactic acid. The mixture is kept at this temperature for 48 to,72 hours and during this time enough lactic acid and peptic enz'yms have formed to peptonize the nitrogein the cottonnitrogenous sub-- and represents the nutriment .whic

about 50 to 1.012 specific gravity seed meal and make them thus available for I .pepton'ized cottonseed mashwhich I will call hereafter, peptone mash-to the newlyprepared mash as these 30 or 40 gallons will contain more than enough lactic acid organisms to start the proper lactic acid fermentation. At the ex iration'of 48 to 72 hours, the peptone masli is transferred into a suitable boiler or cooker and is cooked for about 1% hours under a pressure of 25 to 35 lbs. This is done to get as much as possible of the cotton-seed meal into solution and also to facilitate the separation of the liquid'containing the peptones residue which operation is preferably done with filter resses. The clear liquid running from the ter presses is absolutely sterile I employ for the ropagation of yeast together with sterilized molasses or other saccharine solutions. The cakes remaining as residue in the filter presses are valuable for feeding catt e.

The molasses which I use for the manufac' ture of yeast is a very low grade of molasses; and to the filtered peptone mash resulting from 5000 lbs. of cotton-seed meal,I add 3000 gallons of it, taking care that the molasses is perfectly sterilized which is accomplished by di luting it with about 3000 gallons of water ,heating it to nearly the boiling point and letting it stand in a covered tank for about 24 hours. At the end of this time I 0001 the molasses to about 26 C. mix it with the filtered peptone mash which previously also was cooled to about 26 C. and with enough water to bring the specific gravity of the solution to about 1.04, set it with pure cultured mother yeast and ferment and aerate the whole mixture n the usual manner known to those conversant with the manufacture of yeast. After about 15 to 18 hours of fermentation, when the density of the liquid has been reduced to about all the yeast is formed, the aeration is stop ed and the yeast is .allowed to settle to t e bottom of the tank. The liquid standing above the yeast contains about 8 to 9% of proof alcohol; it is drawn off from the remain ng and used for distillation, in the usual manner. The yeast on the bottom of the tank s washed three or four times with fresh cold water mixed with a small amount of starch,

and it in the shape-of compressed yeast. The yeast may be put 011 the market in this'form or it may be further concentrated by drying it at a low temperature in any of the known manners. I l

Having thus described my invention, I claim as new and desire to secure by Letters Patent: x

1. The processof manufacturing yeast by the use of cotton-seed meal, consisting in peptonizing the nitrogenous substances contamed therein, extracting the same from the solid residue, mixing the extract with a saccharine solution, then inoculating the same with yeast, then propagating yeast, and then i separating theyeast.

' 2. The process of manufacturing yeast by the use of cotton-se'ed meal, consisting in pepte'nizing the nitrogenous substances contamed therein, boiling the same under pres-- sure, then extracting the same from the solid residue, then mixing the extract with steril ized saccharine solution, then inoculating the same with yeast, then propagating yeast, and then separating the yeast,

pumped into filter presses in order to get 3. The process of manufacturing yeast by' meal, consisting in rocess of manufactuing .yeast by then inoculating the same with.

cotton-seed meal, consisting in mixing the meal with water, heating the mixture to a temperature best suited to lactic acid formation, then keeping the-same at approximately the same temperature for a period of time, then boiling the same under pressure, then extracting the liquid from the solid residue, then mixing the extract with sterilized molasses, then inoculating the same with yeast, then propagating yeast, and then separating the yeast.

In testimony whereof I have signed my name to this specification in'thepresence of two subscribing witnesses.

i JACOB BLUMER. Witnesses JNo. M. BITT R, 0. R. FERGUSON. 

